Patents by Inventor Charles D. Wintill

Charles D. Wintill has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Formation saver sub and method
    Patent number: 8151891
    Abstract: A formation saver sub or pump out sub incorporating an anti-surge feature. The sub includes a body, a mandrel, a piston (or an annulus fluid pressure chamber and a tubular pressure chamber), a sleeve, a spring, a releasable seat, and a plug. The plug and seat are released from the sub when one or more dogs releasably positioning the seat in the mandrel bore disengages from the seat due to a bleed off of fluid pressure in the well bore.
    Type: Grant
    Filed: March 2, 2011
    Date of Patent: April 10, 2012
    Assignee: PetroQuip Energy Services, LP
    Inventors: William J. Darnell, Charles D. Wintill, Rodney W. Long
  • Formation saver sub and method
    Patent number: 7921922
    Abstract: A formation saver sub or pump out sub incorporating an anti-surge feature. The sub includes a body, a mandrel, a piston (or an annulus fluid pressure chamber and a tubular pressure chamber), a sleeve, a spring, a releasable seat, and a plug. The plug and seat are released from the sub when one or more dogs releasably positioning the seat in the mandrel bore disengages from the seat due to a bleed off of fluid pressure in the well bore.
    Type: Grant
    Filed: August 5, 2008
    Date of Patent: April 12, 2011
    Assignee: PetroQuip Energy Services, LP
    Inventors: William J. Darnell, Charles D. Wintill, Rodney W. Long
  • Formation saver sub and method
    Publication number: 20100032155
    Abstract: A formation saver sub or pump out sub incorporating an anti-surge feature. The sub includes a body, a mandrel, a piston, a sleeve, a spring, a releasable seat, and a plug. In an alternative embodiment, the sub includes a body, a mandrel, a piston, an annulus fluid pressure chamber, a tubular pressure chamber, a sleeve, a releasable seat, and a plug. The plug and seat are released from the sub when one or more dogs releasably positioning the seat in the mandrel bore disengages from the seat due to a bleed off of fluid pressure in the well bore.
    Type: Application
    Filed: August 5, 2008
    Publication date: February 11, 2010
    Inventors: William J. Darnell, Charles D. Wintill, Rodney W. Long